text: /* $OpenLDAP: pkg/ldap/servers/slapd/compare.c,v 1.75.2.8 2003/02/10 19:22:46 kurt Exp $ */
  /*
   * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
   * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   */
  /*
   * Copyright (c) 1995 Regents of the University of Michigan.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms are permitted
   * provided that this notice is preserved and that due credit is given
   * to the University of Michigan at Ann Arbor. The name of the University
   * may not be used to endorse or promote products derived from this
   * software without specific prior written permission. This software
   * is provided ``as is'' without express or implied warranty.
   */
  
  #include "portable.h"
  
  #include <stdio.h>
  #include <ac/socket.h>
  
  #include "ldap_pvt.h"
  #include "slap.h"
  #ifdef LDAP_SLAPI
  #include "slapi.h"
  #endif
  
  static int compare_entry(
  	Connection *conn,
  	Operation *op,
  	Entry *e,
  	AttributeAssertion *ava );
  
  int
  do_compare(
      Connection	*conn,
      Operation	*op
  )
  {
  	Entry *entry = NULL;
  	Entry *fentry = NULL;
  	struct berval dn = { 0, NULL };
  	struct berval pdn = { 0, NULL };
  	struct berval ndn = { 0, NULL };
  	struct berval desc = { 0, NULL };
  	struct berval value = { 0, NULL };
  	AttributeAssertion ava = { NULL, { 0, NULL } };
  	Backend	*be;
  	int rc = LDAP_SUCCESS;
  	const char *text = NULL;
  	int manageDSAit;
  
  #ifdef LDAP_SLAPI
  	Slapi_PBlock *pb = op->o_pb;
  #endif
  
  	ava.aa_desc = NULL;
  
  #ifdef NEW_LOGGING
  	LDAP_LOG( OPERATION, ENTRY, "do_compare: conn %d\n", conn->c_connid, 0, 0 );
  #else
  	Debug( LDAP_DEBUG_TRACE, "do_compare\n", 0, 0, 0 );
  #endif
  	/*
  	 * Parse the compare request.  It looks like this:
  	 *
  	 *	CompareRequest := [APPLICATION 14] SEQUENCE {
  	 *		entry	DistinguishedName,
  	 *		ava	SEQUENCE {
  	 *			type	AttributeType,
  	 *			value	AttributeValue
  	 *		}
  	 *	}
  	 */
  
  	if ( ber_scanf( op->o_ber, "{m" /*}*/, &dn ) == LBER_ERROR ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, ERR, 
  			"do_compare: conn %d  ber_scanf failed\n", conn->c_connid, 0, 0 );
  #else
  		Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  #endif
  		send_ldap_disconnect( conn, op,
  			LDAP_PROTOCOL_ERROR, "decoding error" );
  		return SLAPD_DISCONNECT;
  	}
  
  	if ( ber_scanf( op->o_ber, "{mm}", &desc, &value ) == LBER_ERROR ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, ERR, 
  			"do_compare: conn %d  get ava failed\n", conn->c_connid, 0, 0 );
  #else
  		Debug( LDAP_DEBUG_ANY, "do_compare: get ava failed\n", 0, 0, 0 );
  #endif
  		send_ldap_disconnect( conn, op,
  			LDAP_PROTOCOL_ERROR, "decoding error" );
  		rc = SLAPD_DISCONNECT;
  		goto cleanup;
  	}
  
  	if ( ber_scanf( op->o_ber, /*{*/ "}" ) == LBER_ERROR ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, ERR, 
  			"do_compare: conn %d  ber_scanf failed\n", conn->c_connid, 0, 0 );
  #else
  		Debug( LDAP_DEBUG_ANY, "ber_scanf failed\n", 0, 0, 0 );
  #endif
  		send_ldap_disconnect( conn, op,
  			LDAP_PROTOCOL_ERROR, "decoding error" );
  		rc = SLAPD_DISCONNECT;
  		goto cleanup;
  	}
  
  	if( ( rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, INFO, 
  			"do_compare: conn %d  get_ctrls failed\n", conn->c_connid, 0, 0 );
  #else
  		Debug( LDAP_DEBUG_ANY, "do_compare: get_ctrls failed\n", 0, 0, 0 );
  #endif
  		goto cleanup;
  	} 
  
  	rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn );
  	if( rc != LDAP_SUCCESS ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, INFO, 
  			"do_compare: conn %d  invalid dn (%s)\n",
  			conn->c_connid, dn.bv_val, 0 );
  #else
  		Debug( LDAP_DEBUG_ANY,
  			"do_compare: invalid dn (%s)\n", dn.bv_val, 0, 0 );
  #endif
  		send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
  		    "invalid DN", NULL, NULL );
  		goto cleanup;
  	}
  
  	rc = slap_bv2ad( &desc, &ava.aa_desc, &text );
  	if( rc != LDAP_SUCCESS ) {
  		send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  		goto cleanup;
  	}
  
  	rc = value_validate_normalize( ava.aa_desc, SLAP_MR_EQUALITY,
  		&value, &ava.aa_value, &text );
  	if( rc != LDAP_SUCCESS ) {
  		send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  		goto cleanup;
  	}
  
  	if( strcasecmp( ndn.bv_val, LDAP_ROOT_DSE ) == 0 ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, ARGS, 
  			"do_compare: dn (%s) attr(%s) value (%s)\n",
  			pdn.bv_val, ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
  #else
  		Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
  			pdn.bv_val, ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
  #endif
  
  		Statslog( LDAP_DEBUG_STATS,
  			"conn=%lu op=%lu CMP dn=\"%s\" attr=\"%s\"\n",
  			op->o_connid, op->o_opid, pdn.bv_val,
  			ava.aa_desc->ad_cname.bv_val, 0 );
  
  		rc = backend_check_restrictions( NULL, conn, op, NULL, &text ) ;
  		if( rc != LDAP_SUCCESS ) {
  			send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  			goto cleanup;
  		}
  
  		rc = root_dse_info( conn, &entry, &text );
  		if( rc != LDAP_SUCCESS ) {
  			send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  			goto cleanup;
  		}
  
  		fentry = entry;
  
  	} else if ( bvmatch( &ndn, &global_schemandn ) ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, ARGS, 
  			"do_compare: dn (%s) attr(%s) value (%s)\n",
  			pdn.bv_val, ava.aa_desc->ad_cname.bv_val,
  			ava.aa_value.bv_val );
  #else
  		Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
  			pdn.bv_val, ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
  #endif
  
  		Statslog( LDAP_DEBUG_STATS,
  			"conn=%lu op=%lu CMP dn=\"%s\" attr=\"%s\"\n",
  			op->o_connid, op->o_opid, pdn.bv_val,
  			ava.aa_desc->ad_cname.bv_val, 0 );
  
  		rc = backend_check_restrictions( NULL, conn, op, NULL, &text ) ;
  		if( rc != LDAP_SUCCESS ) {
  			send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  			rc = 0;
  			goto cleanup;
  		}
  
  		rc = schema_info( &entry, &text );
  		if( rc != LDAP_SUCCESS ) {
  			send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  			rc = 0;
  			goto cleanup;
  		}
  		fentry = entry;
  	}
  
  	if( entry ) {
  		rc = compare_entry( conn, op, entry, &ava );
  		if( fentry) entry_free( fentry );
  
  		send_ldap_result( conn, op, rc, NULL, text, NULL, NULL );
  
  		if( rc == LDAP_COMPARE_TRUE || rc == LDAP_COMPARE_FALSE ) {
  			rc = 0;
  		}
  
  		goto cleanup;
  	}
  
  	manageDSAit = get_manageDSAit( op );
  
  	/*
  	 * We could be serving multiple database backends.  Select the
  	 * appropriate one, or send a referral to our "referral server"
  	 * if we don't hold it.
  	 */
  	if ( (be = select_backend( &ndn, manageDSAit, 0 )) == NULL ) {
  		BerVarray ref = referral_rewrite( default_referral,
  			NULL, &pdn, LDAP_SCOPE_DEFAULT );
  
  		send_ldap_result( conn, op, rc = LDAP_REFERRAL,
  			NULL, NULL, ref ? ref : default_referral, NULL );
  
  		ber_bvarray_free( ref );
  		rc = 0;
  		goto cleanup;
  	}
  
  	/* check restrictions */
  	rc = backend_check_restrictions( be, conn, op, NULL, &text ) ;
  	if( rc != LDAP_SUCCESS ) {
  		send_ldap_result( conn, op, rc,
  			NULL, text, NULL, NULL );
  		goto cleanup;
  	}
  
  	/* check for referrals */
  	rc = backend_check_referrals( be, conn, op, &pdn, &ndn );
  	if ( rc != LDAP_SUCCESS ) {
  		goto cleanup;
  	}
  
  #ifdef NEW_LOGGING
  	LDAP_LOG( OPERATION, ARGS, 
  		"do_compare: dn (%s) attr(%s) value (%s)\n",
  		pdn.bv_val, ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
  #else
  	Debug( LDAP_DEBUG_ARGS, "do_compare: dn (%s) attr (%s) value (%s)\n",
  	    pdn.bv_val, ava.aa_desc->ad_cname.bv_val, ava.aa_value.bv_val );
  #endif
  
  	Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu CMP dn=\"%s\" attr=\"%s\"\n",
  	    op->o_connid, op->o_opid, pdn.bv_val,
  		ava.aa_desc->ad_cname.bv_val, 0 );
  
  
  #if defined( LDAP_SLAPI )
  	slapi_x_backend_set_pb( pb, be );
  	slapi_x_connection_set_pb( pb, conn );
  	slapi_x_operation_set_pb( pb, op );
  	slapi_pblock_set( pb, SLAPI_COMPARE_TARGET, (void *)dn.bv_val );
  	slapi_pblock_set( pb, SLAPI_MANAGEDSAIT, (void *)manageDSAit );
  	slapi_pblock_set( pb, SLAPI_COMPARE_TYPE, (void *)desc.bv_val );
  	slapi_pblock_set( pb, SLAPI_COMPARE_VALUE, (void *)&value );
  
  	rc = doPluginFNs( be, SLAPI_PLUGIN_PRE_COMPARE_FN, pb );
  	if ( rc != 0 ) {
  		/*
  		 * A preoperation plugin failure will abort the
  		 * entire operation.
  		 */
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, INFO, "do_compare: compare preoperation plugin "
  				"failed\n", 0, 0, 0);
  #else
  		Debug(LDAP_DEBUG_TRACE, "do_compare: compare preoperation plugin "
  				"failed.\n", 0, 0, 0);
  #endif
  		if ( slapi_pblock_get( pb, SLAPI_RESULT_CODE, (void *)&rc ) != 0)
  			rc = LDAP_OTHER;
  		goto cleanup;
  	}
  #endif /* defined( LDAP_SLAPI ) */
  
  	if ( be->be_compare ) {
  		(*be->be_compare)( be, conn, op, &pdn, &ndn, &ava );
  	} else {
  		send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
  			NULL, "operation not supported within namingContext",
  			NULL, NULL );
  	}
  
  #if defined( LDAP_SLAPI )
  	if ( doPluginFNs( be, SLAPI_PLUGIN_POST_COMPARE_FN, pb ) != 0 ) {
  #ifdef NEW_LOGGING
  		LDAP_LOG( OPERATION, INFO, "do_compare: compare postoperation plugins "
  				"failed\n", 0, 0, 0 );
  #else
  		Debug(LDAP_DEBUG_TRACE, "do_compare: compare postoperation plugins "
  				"failed.\n", 0, 0, 0);
  #endif
  	}
  #endif /* defined( LDAP_SLAPI ) */
  
  cleanup:
  	free( pdn.bv_val );
  	free( ndn.bv_val );
  	if ( ava.aa_value.bv_val ) free( ava.aa_value.bv_val );
  
  	return rc;
  }
  
  static int compare_entry(
  	Connection *conn,
  	Operation *op,
  	Entry *e,
  	AttributeAssertion *ava )
  {
  	int rc = LDAP_NO_SUCH_ATTRIBUTE;
  	Attribute *a;
  
  	if ( ! access_allowed( NULL, conn, op, e,
  		ava->aa_desc, &ava->aa_value, ACL_COMPARE, NULL ) )
  	{	
  		return LDAP_INSUFFICIENT_ACCESS;
  	}
  
  	for(a = attrs_find( e->e_attrs, ava->aa_desc );
  		a != NULL;
  		a = attrs_find( a->a_next, ava->aa_desc ))
  	{
  		rc = LDAP_COMPARE_FALSE;
  
  		if ( value_find( ava->aa_desc, a->a_vals, &ava->aa_value ) == 0 ) {
  			rc = LDAP_COMPARE_TRUE;
  			break;
  		}
  	}
  
  	return rc;
  }
  